The One Chicago universe established a great duo during the 2025 crossover, and Chicago Fire continues their story in season 13, episode 19, "Permanent Damage." Over the years, the One Chicago TV shows have brought together numerous characters who rarely interact. Most recently, the 2025 crossover, "In the Trenches," featured many unsuspecting but great pairings who all worked together to save victims (including two of their own) trapped underground in a subway tunnel thanks to a gas explosion.
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